<template>
  <div class="subject">
    <span>{{ num1 }}</span>
    <span>+</span>
    <span>{{ num2 }}</span>
    <span>=</span>
    <input type="number" :data-sum="sum" v-model.number="sumVM" />
    <button @click="submitFn">提交</button>
  </div>
</template>

<script>
export default {
  props: ["num1", "num2", "sum", "sumVM", "index"],
  methods: {
    submitFn() {
      //console.log(this.sum, this.sumVM, this.index);
      this.$emit("subsum", this.sum, this.sumVM,this.index);
    },
  },
};
</script>

<style scoped>
.subject {
  margin: 5px;
  padding: 5px;
  font-size: 20px;
}
.subject span {
  display: inline-block;
  text-align: center;
  width: 20px;
}
.subject input {
  width: 50px;
  height: 20px;
}
</style>
